OK, this is the extent to which you can overlap dwebs and swarms in various directions. You can open the map in play mode and verify that they work. You can open them in scmdraft and check the size of the overlap in the boxes and cut and paste into your map if you want. The situation at the corners seems to be different from those in the horizontal and vertical directions.
modified by Lancet

uh, thanks. that's something good for now.

How do you make permanent DWebs or Swarms when youre map making?

-> article section (down on the right)

Lol I meant how do you put them in? I tried doing them from units but it didnt show up...does it have to be from Sprites>Unit Sprites?
Maybe I missed it buy I didnt see it in the article...